摘要
以咸丰重质碳酸钙为原料,钛酸酯偶联剂和铝酸酯偶联剂为改性剂,采用干法改性制备了改性重质碳酸钙。采用正交试验设计探讨了改性温度、改性剂用量、改性时间和搅拌转速对重质碳酸钙改性效果的影响,结果表明,当温度为90℃,钛酸酯偶联剂用量为咸丰重质碳酸钙质量的1.5%,改性时间45 min,转速500 r/min时,钛酸酯偶联剂改性重质碳酸钙的改性效果较好,其活化率可达93.4%。利用FT-IR、XRD、SEM、Zeta电位对重质碳酸钙进行表征,结果表明,钛酸酯偶联剂成功接枝到重质碳酸钙表面,同时发现铝酸酯偶联剂与咸丰重质碳酸钙表面发生了作用。经过钛酸酯偶联剂和铝酸酯偶联剂改性并未改变重质碳酸钙晶型。但铝酸酯偶联剂改性重质碳酸钙的Zeta电位提高到33.2 mV,大于钛酸酯偶联剂改性重质碳酸钙的Zeta电位28.9 mV,铝酸酯偶联剂改性重质碳酸钙粉体粒径更小,具有良好分散性。
The modified heavy calcium carbonate was prepared by dry modification with heavy calcium carbonate from Xianfeng as raw material and titanate coupling agent or aluminate coupling agent as modifier.The effects of modification temperature,amount of modifier,modification time and stirring speed on the modification of modified heavy calcium carbonate were investigated by orthogonal test design.The results showed that when the modification temperature was 90℃,the amount of titanate coupling agent was 1.5%of the quality of heavy calcium carbonate,the modification time was 45 min,and the speed was 500 r/min,the activation rate of modified heavy calcium carbonate by titanate coupling agent was highest,reaching 93.4%.The heavy calcium carbonate was characterized by using Fourier transform infrared spectra(FTIR),X-Ray powder diffraction(XRD),scanning electron microscopy(SEM)and Zeta potential.The results showed that the crystalline phases of heavy calcium carbonate were not changed by the modification of titanate coupling agent or aluminate coupling agent.The results from FT-IR spectra showed that titanate coupling agent had been grafted onto the surface of heavy calcium carbonate.And the new bond was formed between aluminate coupling agent and heavy calcium carbonate.The Zeta potential of heavy calcium carbonate modified by aluminate coupling agent was increased to 33.2 mV,which was higher than that of titanate coupling agent modified by 28.9 mV,and the particle size of heavy calcium carbonate modified by aluminate coupling agent was smaller and had good dispersibility.
作者
胡盛
袁晓慧
高雪
洪颖
熊枝敏
石新雨
胡卫兵
Hu Sheng;Yuan Xiaohui;Gao Xue;Hong Ying;Xiong Zhimin;Shi Xinyu;Hu Weibing(Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province,Hubei Minzu University,Enshi,Hubei 445000;School of Chemical and Environment Engineering,Hubei Minzu University,Enshi,Hubei 445000)
出处
《非金属矿》
CAS
CSCD
北大核心
2020年第2期73-76,共4页
Non-Metallic Mines
基金
恩施州科技计划项目(D20180027)
湖北民族大学博士启动基金项目(MY2017B023)。
关键词
重质碳酸钙
干法改性
钛酸酯偶联剂
铝酸酯偶联剂
活化率
heavy calcium carbonate
dry modification
titanate coupling agent
alminate coupling agent
activation degree
